聚合物
材料科学
电解质
锂(药物)
固态
化学工程
聚合物电解质
离子电导率
复合材料
化学
电极
医学
工程类
内分泌学
物理化学
作者
Yi Cui,Yi Cui,Jiayu Wan,Yusheng Ye,Kai Liu,Lien‐Yang Chou,Yi Cui,Yi Cui
出处
期刊:Nano Letters
[American Chemical Society]
日期:2020-02-05
卷期号:20 (3): 1686-1692
被引量:300
标识
DOI:10.1021/acs.nanolett.9b04815
摘要
Safety issues in lithium-ion batteries have raised serious concerns due to their ubiquitous utilization and close contact with the human body. Replacing flammable liquid electrolytes, solid-state electrolytes (SSEs) is thought to address this issue as well as provide unmatched energy densities in Li-based batteries. However, among the most intensively studied SSEs, polymeric solid electrolyte and polymer/ceramic composites are usually flammable, leaving the safety issue unattended. Here, we report the first design of a fireproof, ultralightweight polymer-polymer SSE. The SSE is composed of a porous mechanic enforcer (polyimide, PI), a fire-retardant additive (decabromodiphenyl ethane, DBDPE), and a ionic conductive polymer electrolyte (poly(ethylene oxide)/lithium bis(trifluoromethanesulfonyl)imide). The whole SSE is made from organic materials, with a thin, tunable thickness (10-25 μm), which endorse the energy density comparable to conventional separator/liquid electrolytes. The PI/DBDPE film is thermally stable, nonflammable, and mechanically strong, preventing Li-Li symmetrical cells from short-circuiting after more than 300 h of cycling. LiFePO4/Li half cells with our SSE show a high rate performance (131 mAh g-1 at 1 C) as well as cycling performance (300 cycles at C/2 rate) at 60 °C. Most intriguingly, pouch cells made with our polymer-polymer SSE still functioned well even under flame abuse tests.
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